Hair dryer



FIG. 1 is a front elevational view of a hair dryer showing my new design, the back elevational view being a mirror image;

FIG. 2 is a right-side elevational view thereof;

FIG. 3 is a left-side elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a hair dryer, as shown and described. 